Machine for grinding drills.



v No. 64l,|07. Patented m. 9, I900. w. c. HEISTER.

MACHINE FUR GRINDING DRILLS.

(Application filed Oct. 7. 1899.)

5 Sheats8heef I.

(No Model.)

Patented Ian. 9, I900.

w. c. HEISTER. MACHINE Fon anmnme DRILLS.

(Application filed. Oct. 7, 1899.)

5 Sheets-Sheet 2.

(No Model.)

I /A/ VENTOH ZQMmLY/[ez BY zhr W/TNESSES A TTOHNEK.

No. 641m. Patentedlan. 9, I900.-

-- w c HEISTER MACHINE FOR GRINDING DRILLS.

(Applicatio n filed Oct. 7, 1899 1 2 5 Sheets-Sheet 3.

(No Model.)

WITNESSES /NVENTOR ATTORNEY.

N0. 64|,|07. Patented Jan. 9, I900.

W C HEISTER MACHINE FOR GRINDING DRILLS.

(Appl e fil :10 t '1 1399 5 Sheets-Sheet 4.

(No Model.)

A TTOHNE Y.

No. 64|,|07. Patented Jan. 9, I900.

W. C. HEISTER. I

MACHINE FUR GRINDING DRILLS.

. (Application filed Oct. 7, 1899.)

(No Model.) 5 Sheets5heett 5.

WITNESSES J lNVE/VTOH A TTOHNE).

Tu: NORRIS PETERS co. PHo'ro-uTHo. WASHINGTON. o. c.

I turn TATES" PATENT Prion.

WILLIAM O. HEISTER, OF DAYTON, OHIO, ASSIGNOR TO THE BUCKEYE IRON- ANDBRASS l/VORKS, OF SAME PLACE.

MACHINE FOR GRINDING DRILLS.

SPECIFICATION forming part of Letters Patent No. 641,107,.dated January9, 1900. Application filed October 7, 1899. Serial No. 732,947. (Nomodel.)

To all whom it may concern: zontally through which is a sleeve 2, thatis Be it known that I, WILLIAM G. HEISTER, held fixed in the standard bya set-screw 3. a citizen of the United States, residing at Day- Journaled in the sleeve is the main or drivton, in the county ofMontgomery and State ing shaft 4, on one end of which is fixed a ofOhio, have invented new and useful Imdrive-pulley 5. Journaled in thestandard 55 provements in Machines for Grinding Drills, above thedriving-shaft is a horizontal shaft of which the following is aspecification. 6, driven by a pulley 7, mounted on one end Thisinvention relates to a machine for thereof andhaving fixed on its otherend an grinding drills, and has for its object to proemery-wheel S.Projecting from the end of vide, in connection with a grinding-wheel, athe sleeve 2 is a bracket-arm 9, to which is 60 holder for holding thedrill and means forimpivotally connected by a bolt 10 a bed or tapartingto said holder a combined rotary, osble comprising a hollow box orcasing 11, cillating, and reciprocating movement to audovetailed on itsupper opposite edges, as at tomatically present both lips ofthe drill tothe 12, (see Figs. 6 and 13,) and arranged to slide grinding-wheel atproper varying angleson said bed or table is a carriage 14:, provided 65 It also has for its object to provide simple on its upper side with ahead 15, in which is means for effecting a very fine adjustment of journaled a tubular drill-holder consisting of the parts, whereby thedrill will be ground a sleeve 16, formed at its forward end with a withmechanical accuracy, greatly increasing flange 17, which abuts the endof the head 15 both the efficiencyand durability of the drill. andprevents any endwise movement of the It has certain other objects inview, which will holder. A chuck is arranged on the forward hereinafterbe made apparent. end of the drill-holder and consists of two To theseends myinvention consists in the jaws 18, arranged to slide in atransverse slot features and in the construction, combinain the end ofthe sleeve 16 and connected to- 25 tion, and arrangement of partshereinafter gether by a right-and-left screw 19, which is described, andparticularly pointed out in the adapted to be engaged and turned to moveclaims following the description, reference the jaws toward and'awayfrom each other. being had to the accompanying drawings, The chuckoperates to grasp and firmly hold forminga part of this specification,wherein-- the drill to be ground in such manner as to 0 Figure 1 is aview in elevation of my imprevent any play of the drillduringthegrindproved machine. Fig. 2 is a top plan view ing operation.thereof. Fig. 3 is a vertical sectional eleva- The numeral 20 indicatesa sleeve which is tion of a partof the same. Fig. 4. is a detail formedto fit snugly within the tubular holder sectional view of the chuck forholding the 16 and is provided with a longitudinally-ta 5 drill. Fig. 5is a plan view of the table or pered bore 21, into which the rear end ofthe casing, the carriage being removed. Fig. 6 drill to be ground isfitted, thus firmly hold is a section taken on the line 6 6 of Fig. 5.ing the rear end of the drill in place, the for- Fig. 7 is a transversesectional view of the ward end of the drill being firmly graspedcarriage. Figs. 8 to 11 are detail views of and held by the chuck. Fixedon the end of 40 the sleeve for holding the rear end of the thedriving-shaft 4 is a pinion 22, which go drill. Fig. 12 is a sectionalview illustrating meshes with a corresponding pinion 23, fixed amodified construction. Fig. 13 is a section ona shaft 24, journaled inbearings 25, formed taken on the line 13 13 of Fig. 12. Fig. 14 is withthe box or casing 11, and fixed on the a detail top plan view of theguide-finger, shaft 24: is a gear-Wheel 26, which gears with 5illustrating the mannerofjointingit; and Fig. a long pinion 27,journaled in the head 15, 5 15 is an end view of the same,illustratingthe and which in turn gears with a gear-wheel manner ofsetting the drill. 28, fixed on the drill-holder 16 by a screw 29.

Referring to the drawings, the numeral 1 Also fixed on the shaft 24 is agear-wheel 30', indicates a pillar or standard forming the which gearswith a pinion 31 of half its size 50 base or support of the machine,passing horifixed on the end of a shaft 32, journaled in one of thebearings 25 and in a corresponding bearing 33. Fixed on the shaft 32 isaheartshaped cam 34, which rotates in contact with two rollers 35,journaled in a ring 36, provided on its opposite sides with trunnions37, which are journaled in a yoke 38. with the yoke 38 is a bracket-arm39, which is rigidly attached to the end of the sleeve 2. Also fixed onthe shaft 32 is a beveled pinion 40, which meshes with a correspondingbeveled pinion 41, fixed on the end of a short shaft 42, journaled in asuitable bearing in the side of the box or casing 11. On the end of theshaft- 42 is pivoted a heart-shaped cam 43, having an arc-shaped slot44, formed concentric with said shaft, through which passes a set-screw45, that screws into-an arm 46, (see Fig. 5,) that is fixed on the shaft42, by means of which the cam may be adjusted on the shaft in an obviousmanner. The cam 43 is arranged to rotate in contact with two rollers 47,journaled in the ends of two short arms 48, pendent from a plate orslide 49, which is adj ustably attached to one side of the carriage 14by set-screws 50, which pass through slots 51, formed in said plate orslide. The rear end of the plate or slide 49 is provided with a laterallug 52, (see Fig. 2,) in which is rotatably arranged a hand-screw 53,which screws into the rear end of the carriage 14. By means of thehand-screw the carriage and slide or plate 49 can be adjusted relativelyto one another, so as to regulate the throw of the carriage under theaction of the cam 43, as will more fully hereinafter appear.

The numeral 55 indicates a downwardcurved guide-finger, which is fittedat its rear end in a socket 56, formed in the end of a bracket-arm 57,pivoted at its rear end to a lug 58, bolted to the head 15 and providedwith a foot 59, adapted to rest on the edge of the flange 17. Theguide-finger is held in the socket by a set-screw 60, which passesloosely through the rear end of the' guide finger. Arranged in thesocket 56 is a follower 55, which is projected forward by a coiledspring 61 and operates to hold the guide-finger in either ofits adjustedpositions, as best illustrated in Fig. 14.

The operation of the device constructed as above described is asfollows: The drill to be ground is first inserted in the sleeve and thelatter is next fitted in the holder 15. The guide-finger is then movedinto the position shown in Fig. 1, and the drill is adjusted until itsend accurately registers with the end of the guide-finger, and one ofits cutting-lips lies in true parallelism with the side of theguide-finger, as shown in Fig. 15, after which the screw 19 is turned totightly grasp and hold the drill.

It will be understood that in most drills there are two lips or cuttingedges arranged diametrically opposite to one another and that ingrinding the end of the drill the metal is ground off more and more asthe cutting Formed edges or lips are receded from, and in order toaccomplish this result as the lip is receded from the drill has to bepresented at a more acute angle to the emery-wheel to grind off moremetal. There being two such lips, it is necessary to change this angleduring each revolution of the drill to grind off from the high to thelow portions of the drill, and this result is accomplished by means ofthe mechanism above described in the following manner: The drill havingbeen set in the holder in the manner described, the guide-finger isthrown backinto the position shown in dotted lines in Fig. 12 and thedriving-shaft 4setin motion. The shaft 4 rotates the shaft 24 throughthe medium of the pinions 22 and 23 and rotates the drill by means ofthe gears 26, 27, and 28. The gear-wheel being twice the size of thegear-wheel 31, the shaft 32 rotates at twice the speed of the shaft 24,and as the cam 34 rotates between the rollers 35 on the fixed yoke 38the box or casing 11 is oscillated in the are of a circle about itspivotal point 10, thereby oscillating the point of the drill in asimilar arc to vary the angle at which it is presented to the face ofthe emerywheel 8, and owing to the shafts 24 and 32 being gearedtogether in the manner described the drill is given two completeoscillations while it is rotated once. As the drill is oscillated backand forth in the manner described to vary the angle at which it ispresented to the emery-wheel the carriage carrying the drill-holder anddrill is reciprocated back and forth by means of the cam 43 r0- tatingbetween the rollers 47, the parts being so timed that as the box orcasing is lowered on its pivot the carriage is fed forward to feedforward the drill to compensate for the downward movement of the box orcasing and hold the drill in contact with the face of the emeryavheel,and during this move= ment the emery-wheel grinds off the drill awayfrom one of the cutting-lips. As the box or casing is raised the cam 43operates to draw the carriage back or rearward to com pensate for theforward movement imparted to the drill by such upward movement of thebox or casing, As before described, these movements occur twice duringeach rotation of the drill to grind off each cutting-lip. By means ofthe hand-screw 53 the carriage may be accurately adjusted relatively tothe cam 43 to insure the reciprocating movement of the carriageaccurately occu ring in proper relation to the oscillating movement ofthe box or casing, and by means of said screw the drill may also be fedforward to the emery wheel as the metal is ground off.

In Figs. 12 and 13 I have illustrated a slightly-modified construction.As shown in said figures of drawings, the intermediate pinion beforedescribed is dispensed with and the gear-wheel 26 meshes directly withthe gear-wheel 28 on the drill-holder. The pinions 22 and 23 are alsodispensed with, and the carriage.

shaft 24 is extended and is connected to the driving-shaft 4 by auniversal coupling 62 of well-known construction. The shaft 32,gear-wheels and 31, pinions and 41, shaft 42, and cam 43 are alsodispensed with, and the cam 34 is mounted directly on the shaft 24. Alsomounted on said shaft is a cam-wheel 63, having a spiral cam-groove 64formed in its periphery, and engaging said cam-groove is a finger 65,pendent from a block 66, which is arranged to slide in ways 67 on thebottom of the carriage. The rear end of the carriage is formed with avertical flange 68, in which is rotatably arranged a hand-screw 69,which engages a corresponding threaded aperture in the block 66, wherebythe block can be adjusted relatively to the The operation of this formof the device will be readily understood. The table or casing 11 will beoscillated and the drill rotated in the manner before described, and thecam 63 will operate through the medium of the finger 65 and block 66 toreciprocate the carriage back and forth in the manner and for thepurpose before set forth.

In both forms of the device shown and described the operation of themachine isautomatic throughout and operates to grind both lips of thedrill with mechanical accuracy, thereby enabling the drill to cut twiceas fast as if one lip only operates to cut. The drill thus ground willbore a uniformly true hole, will keep its edge longer, and bore manymore holes than drills ground by hand.

The machine will grind flat and twist drills and drills of all kinds andwill give any clearance desired, ranging from twenty-nine and one-halfdegrees to thirty-seven and one-half degrees.

It will be obvious that many of the details of my invention may bevaried or altered without departing from the spirit thereof, andtherefore I do not wish to be understood as limiting myself thereto,excepting as hereinafter pointed out in the claims.

In practice the pivot 10 of the hollow box or table 11 should bearranged directly central on the pitch-line of the gears 22 and 23, sothat the rocking or oscillating movement of said table will beinsufficient to throw the gears out of mesh.

By pivoting the bracket-arm 57 in the manner described said bracket-armand the guidefinger 55 may be thrown up into the position shown in Fig.12 in order to give ready ac cess to the screw 19 in adjusting the jawsof the chuck. After the drill has been set by the guide-finger in themanner before described the guide-finger may be swung around to oneside, as shown in Fig. l5 where it will be out of the way during thegrinding operation. The guide-finger is held in either of its adjustedpositions by the spring-follower 55 in an obvious manner.

Having described my invention, what I claim is- 1. In a machine forgrinding drills,the combination with a grinding-wheel, of a carriageprovided with means for holding the drill, means for oscillating saidcarriage in the arc of a circle lying in a plane at right angles to theoperative face of the grinding-wheel to present the drill at varyingangles to the grinding-wheel,and means for simultaneously reciprocatingthe carriage to compensate for its oscillating movement, substantiallyas described.

2. In a machine for grinding drills,the combination with agrinding-wheel, of a carriage provided with means for holding the drill,means for oscillating the carriage alternately toward and from thegrinding-wheel in the arc of a circle lying in a plane at right anglesto the operative face of the grinding-wheel to vary the angle at whichthe drill is presented thereto, means for reciprocating the carriagetoward the grinding-wheel and simultaneously loweringitin the arc of acircle, means for reciprocating the carriage away from thegrinding-wheel and simultaneously raising it in the arc of a circle, andmeans for rotating the drill, substantially as described.

3. In a machine for grinding drills,the combination with agrinding-wheel, of a table, a carriage arranged to reciprocate on thetable and provided with means for holding a drill, means for oscillatingthe table in the arc of a circle to vary the angle at which the drill ispresented to the grinding-wheel,and means for reciprocating the carriageon the table toward and from the grinding-wheel and sim ultaneousl ywith the oscillating movement of the table, substantially as describedand for the purpose specified. y

4. In a machine for grinding drills,the con1- bination with agrinding-wheel, of a pivoted table, a carriage arranged to reciprocateon the table and provided with a rotatable drillholder, means forrotating the drill-holder, means for oscillating the table in the arc ofa circle to vary the angle at which the drill is presented to thegrinding-wheel,and means for reciprocating the carriage on the tabletoward and from the grinding-wheel simultaneously with the oscillatingmovement of the table, substantially as described.

5. In a machine for grinding drills,the combination with agrinding-wheel, of a pivoted table, a carriage arranged to reciprocateon the table and provided with a rotatable drillholder, means forrotating the drill-holder, means for oscillating the table about itspivotal point in the arc of a vertical circle to vary the angle at whichthe drill is presented to the grinding-wheel, and means for reciprocating the carriage toward the grinding wheel as the table is lowered andaway from the grinding-wheel as the table is raised, substantially asdescribed and for the purpose specified.

6. In a machine for grinding drills,the combination with agrinding-wheel, of a pivoted table, a carriage arranged to reciprocateon the table and provided with a rotatable drill holder, means forrotating the drill-holder, means for oscillating the table about itspivotal point in the arc of a circle toward and from the grinding-wheel,said means being constructed and arranged to communicate two completeoscillations to the table during each rotation of the drill-holder, andmeans for reciprocating the carriage toward the grinding-wheel as thetable is lowered and in the opposite direction as the table is raised,substantially as described and for the purpose specified.

7. In a machine for grinding drills, the combination with agrinding-wheel, of a pivoted table, a carriage arranged to reciprocateon the table and provided with a rotatable drillholder, means forrotating the drill-holder, means for oscillating the table about itspivotal point in the arc of a circle toward and from the grinding-wheel,said means being constructed and arranged to communicate two completeoscillations to the table during each rotation of the drill-holder,means for reciprocating the carriage toward the grinding-wheel as thetable is lowered and in the opposite direction as the table is raised,and means for feeding the carriage toward the grinding-wheelindependently of its reciprocating movement, substantially as described.

8. In a machine for grinding drills, the combination with agrinding-wheel, of a pivoted table, a carriage arranged to reciprocateon the table and provided with a rotatable drillholder means forrotating the drill-holder, means for oscillating the table about itspivotal point in the arc of a circle toward and from the grinding-wheel,means for reciprocatin g the carriage toward and from the grinding-wheelsimultaneously with the oscillating movement of the table, and means foradjusting the carriage on the table toward and from the grinding-wheelindependently of the reciprocating movement of the table, substantiallyas described.

9. In a machine for grinding drills, the combination with agrinding-wheel, of a pivotal table, a carriage arranged to reciprocateon the table and provided with a rotatable drillholder, means forrotating the drill-holder, means for oscillating the table about itspivotal point in the arc of a circle toward and from the grinding-wheel,means for reciprocating the carriage toward and from the grinding-wheelsimultaneously with the oscillating movement of the table, and meansoperated by hand for adjusting the carriage on the table, substantiallyas described.

10. In a machine for grinding drills,the combination with agrinding-wheel, of a pivoted table, a driven shaft journaled in thetable, a carriage arranged to reciprocate on the table, a rotatabledrill-holder journaled on the carriage,a gear-wheel fixed on thedrill-holder,

a gear-wheel fixed on the driven shaft and operating to transmit rotarymotion from said shaft to the drill-holder, means for oscillating thetable about its pivotal point in the arc of a circle toward and from thegrinding-Wheel; and means for reciprocating the carriage toward and fromthe grinding-wheel as the table is lowered and raised, substantially asdescribed and for the purpose specified.

11. In a machine for grinding drills,the combination with agrinding-wheel, of a pivoted table, a driven shaft journaled in thetable, a carriage arranged to reciprocate on the table toward and fromthe grinding-wheel, a rotatable drill-holder journaled on the car riagegearing for transmitting rotary motion from the driven shaft to thedrill-holder, and mechanism operated by the driven shaft for impartingto the table an oscillating movement about its pivotal point toward andfrom the grinding-wheel in the arc of a circle and for simultaneouslyreciprocating the carriage toward and from the grinding-wheel,substantially as described and for the purpose specified.

12. In a machine for grinding drills,the combination with agrinding-wheel, of a pivoted table, a driven shaft journaled on thetable, a carriage arranged to reciprocate on the table toward and fromthe grinding-wheel, a rotatable drill-holder journaled on the carriage,gearing for transmitting rotary motion from the driven shaft to thedrill-holder, mechanism operated by the driven shaft for oscillating thetable about its pivot in the arc of a circle toward and from thegrindingwheel, a' cam rotated by the driven shaft, and an attachmentcarried by the carriage and engaging said cam to reciprocate thecarriage, substantially as described.

13. In a machine forgrindingdrills,the combination with agrinding-wheel, of a pivoted table, a driven shaft journaled on thetable, a carriage arranged to reciprocate on the table toward and fromthe grinding-wheel, a rotatable drill-holder journaled on the carriage,gearing for transmitting rotary motion from the driven shaft to thedrill-holder, mechanism operated by the driven shaft for oscillating thetable about its pivot in the arc of a circle toward and from thegrindingwheel, a cam rotated by the driven shaft, and a projectionadjustably connected with the carriage and engaging said cam toreciprocate the carriage toward and from the grind ing-wheel,substantially as described.

14. In a machine for grinding dril1s,the combination with agrinding-wheel, of a pivoted table, a driven shaft journaled on thetable, a carriage arranged to reciprocate on the table toward and fromthe grinding-wheel, a rotatable drill-holder journaled on the carriage,gearing for transmitting rotary motion from the shaft to thedrill-holder, mechanism operated by said shaft for oscillating the tableabout its pivot in the arc of a circle toward and from thegrinding-Wheel, aspirallygrooved cam fixed on the shaft, a block mountedin ways on the carriage, an adj ustingscrew for adjustably fixing theblock rela= tively to the table, and a finger carried by said block andengaging the grooved cam to rotatable drill-holder journaled on thecarriage, gearing for transmitting rotary motion from the shaft to thedrill-holder, a cam fixed.

on said shaft and rotating between fixed antifriction-rollers tooscillate the table in the arc of a circle toward and from thegrindingwheel, and means for reciprocating the carriage, substantiallyas described.

16. Inamachineforgrindingdri1ls,thec01nbination with a grinding-wheel,of a pivoted table, a driven shaft journaled on the table, a carriagearranged to reciprocate on the table toward and from the grinding-wheel,a rotatable drill-holder journaled on the carriage, gearing fortransmitting rotary motion from the shaft to the drill-holder, a camfixed on said shaft, a fixed yoke, a ring swiveled in the yoke andprovided with antifrictionrollers engaging theperiphery of the cam tocause the table to oscillate about its pivot in the are of a circletoward and from the grinding-wheel, and means for reciprocating thecarriage, substantially as described.

17. In a machine for grinding dri1ls,the combination with agrinding-wheel, of a pivoted table, a driving-shaft journaled on thetable, a carriage arranged to reciprocate on the table toward and fromthe grinding-wheel, a rotatable drill-holder journaled on the carriageand having a gear-wheel fixed thereon, a gearwheel fixed on the drivenshaft and gearing with the gear-wheel on the drill-holder to r0- tatethe latter, a cam fixed on the shaft and rotating between fixedantifriction-rollers to oscillate the table about its pivot in the arcof a circle toward and from the grinding-wheel, a spirally-grooved camon the driven shaft, and a finger carried by the carriage and engagingsaid spiral groove to reciprocate the carriage on the tablesimultaneously with the oscillating movement of the latter.

18. In a machine for grinding drills,the combination with agrinding-wheel, of a pivoted table, a carriage arranged to reciprocateon the table toward and from the grinding-wheel, means for reciprocatingthe carriage, means for oscillating the table on its pivot in the arc ofa circle toward and from the grindin g-wheel,

a rotatable sleeve journaled on the carriage, a chuck carried on theforward end of the sleeve, and a sleeve fitted in the rear end of therotatable sleeve and having a tapered bore, substantially as describedand for the purpose specified.

19. In a machine for grinding drills,the combination with agrinding-wheel, of a pivoted table,a carriage arranged to reciprocate onthe table toward and from the grinding-wheel, means for reciprocatingthe carriage, means for oscillating the table on its pivot in the arc ofa circle toward and from the grinding-wheel, a rotatable sleevejournaled on the carriage, a chuck on the forward end of the sleevecomprising two sliding jaws fitted to move in a transverse slot in theend of the sleeve, a right-and-left screw fitted in said jaws, and meansfor rotating the sleeve, substantially as described.

20. In a machine for grinding drills,the combination with agrinding-wheel, of a table pivoted at a point in front of and below thegrinding-wheel, a carriage arranged to reciprocate on the table towardand from the grinding-wheel, means for reciprocating the carriage, meansfor oscillating the table on its pivot in the arc of a circle toward andfrom the grinding-wheel, a rotatable drill-holder j ournaled on thecarriage, and a guide for setting the drill in the holder, substantiallyas described.

21. In a machine forgrindingdrills,the combination with a combinedoscillating and reciprocating carriage, of a rotatable drill-holdermounted on the carriage and provided with means for grasping and holdinga drill, and a pivoted guide-finger carried by the carriage, forsettingthe drill,substantially as described.

22. In a machine for grinding drills,the combination with a combinedoscillating andreciprocating carriage, of a rotatable drill-holdermounted on the carriage and provided with means for grasping and holdinga drill, and a pivoted guide-finger carried by the carriage, saidguide-finger being curved downward at its free end and jointedintermediate its ends,

substantially as described.

In testimony whereof I'have hereunto set my hand in presence of twosubscribing witnesses.

WILLIAM C. HEISTER.

lVitnesses:

JOSEPH H. HUBBELL, Orro B. FRANK.

